#include "AsmInclude.h"

$NOMOD51
;------------------------------------------------------------------------------
;  This file is part of the C51 Compiler package
;  Copyright (c) 1988-2002 Keil Elektronik GmbH and Keil Software, Inc.
;------------------------------------------------------------------------------
;  STARTUP.A51:  This code is executed after processor reset.
;
;  To translate this file use A51 with the following invocation:
;
;     A51 STARTUP.A51
;
;  To link the modified STARTUP.OBJ file to your application use the following
;  BL51 invocation:
;
;     BL51 <your object file list>, STARTUP.OBJ <controls>
;
;------------------------------------------------------------------------------
;
;  User-defined Power-On Initialization of Memory
;
;  With the following EQU statements the initialization of memory
;  at processor reset can be defined:
;
EXTRN CODE(SCALERMCUMEMORYZEROINIT)
;               ; the absolute start-address of IDATA memory is always 0
; IDATALEN        EQU     0100H     ; the length of IDATA memory in bytes.
;
; the absolute start-address of XDATA memory
; XDATASTART      EQU     _XRAM_ADDR_START
; the length of XDATA memory in bytes.
;
; PDATASTART      EQU     0H      ; the absolute start-address of PDATA memory
; PDATALEN        EQU     0H      ; the length of PDATA memory in bytes.
;
;  Notes:  The IDATA space overlaps physically the DATA and BIT areas of the
;          8051 CPU. At minimum the memory space occupied from the C51
;          run-time routines must be set to zero.
;------------------------------------------------------------------------------
;
;  Reentrant Stack Initilization
;
;  The following EQU statements define the stack pointer for reentrant
;  functions and initialized it:
;
;  Stack Space for reentrant functions in the SMALL model.
IBPSTACK        EQU     0       ; set to 1 if small reentrant is used.
IBPSTACKTOP     EQU     0FFH+1  ; set top of stack to highest location+1.
;
;  Stack Space for reentrant functions in the LARGE model.
XBPSTACK        EQU     0       ; set to 1 if large reentrant is used.
XBPSTACKTOP     EQU     0FFFFH+1; set top of stack to highest location+1.
;
;  Stack Space for reentrant functions in the COMPACT model.
PBPSTACK        EQU     0       ; set to 1 if compact reentrant is used.
PBPSTACKTOP     EQU     0FFFFH+1; set top of stack to highest location+1.
;
;------------------------------------------------------------------------------
;
;  Page Definition for Using the Compact Model with 64 KByte xdata RAM
;
;  The following EQU statements define the xdata page used for pdata
;  variables. The EQU PPAGE must conform with the PPAGE control used
;  in the linker invocation.
;
PPAGEENABLE     EQU     0       ; set to 1 if pdata object are used.
;
PPAGE           EQU     0       ; define PPAGE number.
;
PPAGE_SFR       DATA    0A0H    ; SFR that supplies uppermost address byte
;               (most 8051 variants use P2 as uppermost address byte)
;
;------------------------------------------------------------------------------

; Standard SFR Symbols
ACC     DATA    0E0H
B       DATA    0F0H
SP      DATA    81H
DPL     DATA    82H
DPH     DATA    83H

                NAME    ?C_STARTUP


?C_C51STARTUP   SEGMENT   CODE
?STACK          SEGMENT   IDATA

                RSEG    ?STACK
                DS      1

                EXTRN CODE (?C_START)
                PUBLIC  ?C_STARTUP

                CSEG    AT      0
?C_STARTUP:     LJMP    STARTUP1

                RSEG    ?C_C51STARTUP

STARTUP1:
; initialize stack pointer value
                MOV     SP,#?STACK-1

; use custom function for memory zero-intialization
                LCALL   SCALERMCUMEMORYZEROINIT

;IF IDATALEN <> 0
;                MOV     R0,#IDATALEN - 1
;                CLR     A
;IDATALOOP:      MOV     @R0,A
;                DJNZ    R0,IDATALOOP
;ENDIF
;
;IF XDATALEN <> 0
;                MOV     DPTR,#XDATASTART
;                MOV     R7,#LOW (XDATALEN)
;  IF (LOW (XDATALEN)) <> 0
;                MOV     R6,#(HIGH (XDATALEN)) +1
;  ELSE
;                MOV     R6,#HIGH (XDATALEN)
;  ENDIF
;                CLR     A
;XDATALOOP:      MOVX    @DPTR,A
;                INC     DPTR
;                DJNZ    R7,XDATALOOP
;                DJNZ    R6,XDATALOOP
;ENDIF
;
;IF PPAGEENABLE <> 0
;                MOV     PPAGE_SFR,#PPAGE
;ENDIF
;
;IF PDATALEN <> 0
;                MOV     R0,#LOW (PDATASTART)
;                MOV     R7,#LOW (PDATALEN)
;                CLR     A
;PDATALOOP:      MOVX    @R0,A
;                INC     R0
;                DJNZ    R7,PDATALOOP
;ENDIF

IF IBPSTACK <> 0
EXTRN DATA (?C_IBP)

                MOV     ?C_IBP,#LOW IBPSTACKTOP
ENDIF

IF XBPSTACK <> 0
EXTRN DATA (?C_XBP)

                MOV     ?C_XBP,#HIGH XBPSTACKTOP
                MOV     ?C_XBP+1,#LOW XBPSTACKTOP
ENDIF

IF PBPSTACK <> 0
EXTRN DATA (?C_PBP)
                MOV     ?C_PBP,#LOW PBPSTACKTOP
ENDIF

;                MOV     SP,#?STACK-1
; This code is required if you use L51_BANK.A51 with Banking Mode 4
; EXTRN CODE (?B_SWITCH0)
;               CALL    ?B_SWITCH0      ; init bank mechanism to code bank 0
                LJMP    ?C_START

STARTUP_CHECK   SEGMENT CODE            ; Segment for custom startup.a51 check
                PUBLIC  SysStartUpCheck
                RSEG    STARTUP_CHECK
SysStartUpCheck:
                RET

                END
